Ruth Rappaport (May 27, 1923 – November 17, 2010) was a Jewish-American librarian. Her mother's cousin was Helena Rubinstein. Rappaport was born in Leipzig, in Saxony to Mendel and Chaja Rappaport. She had two older half-sisters, Mirjam Rappaport Schneider and Clara Rappaport Rosner. She was a foster child in Zurich in 1938, after running away from her parents when she refused to return to Germany. In 1943 her father died in Buchenwald and her mother probably died in Ravensbrueck.